From 8b04d28a5ba0137a985b72b3f512581dea835493 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 24 Jul 2020 11:19:17 +0200
Subject: [PATCH] createUnixDomainSocket(): Fix off-by-one error in copying the
 socket path

Reported by Kane York.

(cherry picked from commit 2292814049256980c6e809ab364ebe0da3c9d76a)
---
 src/nix-daemon/nix-daemon.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nix-daemon/nix-daemon.cc b/src/nix-daemon/nix-daemon.cc
index cd18489b0..7a5cb9a37 100644
--- a/src/nix-daemon/nix-daemon.cc
+++ b/src/nix-daemon/nix-daemon.cc
@@ -967,7 +967,7 @@ static void daemonLoop(char * * argv)
 
         struct sockaddr_un addr;
         addr.sun_family = AF_UNIX;
-        if (socketPathRel.size() >= sizeof(addr.sun_path))
+        if (socketPathRel.size() + 1 >= sizeof(addr.sun_path))
             throw Error(format("socket path '%1%' is too long") % socketPathRel);
         strcpy(addr.sun_path, socketPathRel.c_str());